The new Star Stories astronomy programme for the 2018/2019 season got off to a great start up at Abriachan Forest Trust last Friday, with plenty of clear breaks in skies for Milky Way observing and binocular stargazing. This was despite very unsettled weather predicted by the MET office as storm Callum blew in from the west.
This first event was in collaboration with the Highland Archaeology Festival, and pitched on a loose Neolithic stargazing theme which I had worked into a backup talk in the event of cloudy skies. As it happened we had enough clear conditions to stargaze all evening and the talk was parked for another occasion.
Due to the healthy turnout we split the night into two streams, with one group joining Abriachan’s Clelland for Celtic tales around an open fire, while the other group joined me under darkness for a laser pointer and binocular tour of visible constellations. We then swapped over at half time.
Both stargazing groups saw plenty of open sky despite fast moving cloud, and we were able to field test the new hand held binoculars funded by our STFC grant. The Milky Way and summer triangle were on fine display in the south with bright lanes of glowing star fields high overhead. We also saw most of the northern circumpolar constellations, including Ursa Major, and discussed Polaris at some length before sighting the Pleiades in the East and the rich clusters within Perseus and Cassiopeia.
But the most dramatic event was gifted to the first group of stargazers, when a spectacular burning meteor soared overhead towards the north, briefly lighting up the whole sky. A subsequent discussion on social media prompted another observer in Lairg – Chris Cogan – to post a picture of a very bright meteor he also saw streaking north and lighting up an entire hillside.
This generated a lively discussion and some investigation into how far away two observers can be situated and still see the same bright meteor. It turns out pretty far!
Due to the high altitude meteors burn up in the atmosphere, about 40 – 60 miles overhead, it’s very possible for two observers hundreds of miles apart to see the same meteor. The only requirement is they lie along the same approximate vector as the burning space rock. In this specific case, Abriachan and Lairg are both in a rough line travelling north. The time recorded on Chris’s picture also checks out with our observing time at Abriachan. So, all told, reasonably convincing evidence we witnessed the same fireball, seventy miles apart.
Overall feedback on the night has been great so far and I’m already looking forward to the Leonids Special in November, when we will be joined by guest speaker Dr Anthony Luke of UHI, talking about the chemistry of stars and meteors.
The night sky photographs for this piece were kindly donated by Claire Rehr . Please visit her Instagram account ‘rehr_images’ to see more of her stunning pictures.